Safety guard for planing machines



p 950 o. BOISVERT 2,521,499

SAFETY GUARD FOR PLANING MACHINES Filed July 29, 1948 3 Inventor OnesrmeBolsverr By @Mw m lim Patented SepL' 'ZS, 1950 OnesimeBoisvert,Oneyvillje, R.-I., assign0r to Edouard N.BomPawtuckeLR; I.

i m c t onituiy a9, 1948, serial n 41,229

'4jClaims. (01. 144- 251)? The present invention'relate's to certain newand useful improvements in a safety type guard f usable inconnection'with woodworkingmachines,

for example, planers,*jointers and the like, and has reference, inparticular, to a guard whose construction is such as to permiteffective; re-

' sistless and proper displacement of work on the table of the machinewliileafiording complete safety, at all times,- toall concerned. 1

In order to appreciate the significanceof the j'fpresent invention it isvirtually essential that the reader first read and understand UQ S.vPatent No. 1,801,326 covering a guard for planinggmachines granted tome under date of April 21', 1931. Briefly, the patented construction hasto do with a fan-like sectional guard, the sections being in the form of"general wedge-shaped plates or blades, the latter beinghirigedlyconnected with one another at corresponding ends, being capableof telescoping and 'nesting one within thelimits ,jof the other andbeing normally expanded to safety positions by, properly constructed andmounted flator leaf springs These types of v guardsi as covered. in thestated patent, are'an- "chore'cl on the work table close to the guide orfence against which the worl; piece is placed and slid along for. coaction with "the cuttermeans. The plate or section'of theiguard closes'tto'the work actually has direct contact with the work and the othersections'are foldable or'retractible;

, depending on the space required for p s g 'the work piece "betweenthefence and coacting or foremost section ofthe guard. Also 'andas andawbolt and nut arrangement,'thenuthaving a lever pivoted-thereon withcam'elements to en- 1 gage thefplate portion of the clip and to,intur n,

' exertthe' pressure thereagainst to bind the overi the same accordingto the requirements f the lappingfhingedly connected ends of the-tatedplate sections whereby to either tighten or'loosen 1 fOtherpbjectsggfeatures and" advantages "Will -be come morereadilyapparent in {the following de-' sc'ription and the accompanyingillustrativev I n'the drawings, wherein like numerals are employed todesignate like parts'th'roughout the viewsz r r Figure 1" isafragmentaryelevational view showing "a'jportion' f a stock typeplaningmachine and further showing the" improved pro- "tectorguard-iriountedFon the machine, or. the

table'of the machine for use. r

' Figure 2 is'a plan view of the guard perse with the plate sectionsspread apart, showingthe' im- "proved hin'ging and locking means,

and attaching pom.

e5 Figure 351$ an l d ragm ntary sectional I u wlo i n'the direction ofthe 1 arrows; I

and ele vational View "on the plane of the line Figure 4 is aperspective View or the assembling Referring now to the drawings,it'will' be understood that so 'far as the improvements herein arefconcerned, I have not'gone intodetail as regards the machine or theprecise manner 'in which the coveredfin the patenttherplate sectionshave coacting detent's onjtheir ends oppositeftof the;f hingedlyconnectedends, which detents-serve to limit the overall spread of theguard as a unitary '-assemblage.-.'At"the hinged-ends a simple .as-

."sembling andiclamping bolt and nut arrangement is employed," thenutbeing a so-called thumb nut;

and practice has shown'that this part of thecon- ,lstruction, thehinging and-nut clampi igme'ans,

is 'notin keeping 'with'modern requirements ofthe I trade and users.-

The object of .the present invention is to pro 'vide"more-Psatisfactorlyiwaysand means whereby the companion}v and 'comcrlenaentalplates are hingedly jconnected. and also bound .frictionallytogether for safetylocking. purposes.

. More specifically, in carrying out-the and- ;contractiblerelationship, there being a I ,at-fl o i -like clip coasti with the hine zends,

principles 01 the present invention, a hollow'nut and rivet serve tohingedly interconnect coacting ends of pthe-platfiSBClliOns inoverlapping and spreadable invention coacts with the machine and thework piece onthern'achinej. Allethatis ner'se'ssa'rihfIv believe,' is toshow broadly any suitablejointer or planer machine 6 having-asupporting'l'egstru'c- 1 ture T and atop or tableportion 8; The workpiece may be denoted .by'the numeral 9 'a'ndthe rotary cutter by thenumeralld. I Notonly am I not/concerned with the details of themachinery herein, but I have not attempted to detract from the noveltyand theshowing in the drawings by including' details of construction ofthe safety guard II. The guard is 's'imilan if v p v not substantiallyidenticaL to that shown inwiny previous Patent No. 1,801,326 except forminor shown.v 'Rev'erting'to the patent it willbenoted;

details and the: improved hinged means .here

that a;bolt.and nut servesto-hingedlyfadjoin the narrowendportions ofthe respective plates'or v v sections. 7 He'rea different type ofconnection and locking means isfiemployed Before discussing I 'thelatteril-wouldlcall attention to the fact that the plate 'isections;which are" of ..wedge-s haped general form are denoted by the numeralsI2, 13,

I4, l5, l5 and H. There is a lug 8 on the first 7 plate section l2 whichis fastened down by a bolt IS on the table portion of the statedmachine. The main or foremost sectionhas the desired curvate edge whichis closest to the work and the work comes into contact with said edgeand cams the plate sections closed, that is, progressively and one atatime depending on the size of the workpiece. Usually, however, thesections are spread out in the fan-like manner disclosed in the drawingsin Figure 2.

Referring now to Figure 3, I call attention to the fact that the narrowor shank portions 2| of the respective plate sections are disposed inover lapping or superimposed relationship and are apertured and that ahollow rivet 23 is-passed modatean assembling nut having outstandingjournals 3! which journals are journaled in bear-- ings pro-videdinspaced parallel portions 32 of a v -U-shaped lock 33. .Theportions 32are formed Withthe cams 34 and theseprovide locking and take-up surfacesand they rest upon the horizontal flexible plate. portion 35 of an angleor cornic type clip. The:fiange portion 36 of the clip is suitablycurved and rests against the coacting rounded end portions of the shanks21. The -pl-ate portion is apertured to accommodate the nut 24 and theclamping cams 3 do not bear on thenut but rather on the plate itself.Thus, by exerting the desired cam press-ureon the plate 3", the latterbinds the shank portions 2! between i the plate and the head 25 on therivet, whereby to frictionally connect the. shanks and to thus lock theaforementioned plate sections in open,

closedand intermediate positions. The U-shaped lock is provided with a"convenient handle or hand-grip 31 as shown in Figure 3. It follows,thatthe novelty here has to do with a clip which is substantiallyL-shaped inconfiguration which caps :or hoods over'the hingedlyconnected shank 1 portions of the spreadable and contractible plateysections. The plate sections or shanks overlap and these are hingedlyconnected by a hollow rivet or bolt which, in turn,- serves to accommo-'date a solid bolt, the solidbolt serving to anchor the entire structureon the work table and the threaded upper end of the bolt projectingbeyond "the corresponding end of the hollow bolt where the assembling,nut 30 carries the cam-lock-33 which is pressed down or lifted up,depending on -:'requirements through the medium of the con- :venienthandle or vhand-grip $1.

This perfected guard has meritorious features which permit nointerference with the workman 'i atany time. This lack of interferenceeffectively 1'does away'with guard-resentment and builds as- .surancethat the guard will always be found in its improper position n thejointer. The guard is so cconstructed and applied to the jointer that itis impossible for it toswing outward from the table 1.:0fsthe jointerinto. the passageway. This preyents serious .anddangerous interferencewith rthei'workman in the passage of stock over the table of jointer; afeature which not only protects -:the workman but alsoinsures the safetyof those passing by. My-guard may be used safely, conveniently andwithout harm to the guard as a return passage for the work. I

A careful consideration of the foregoing description in conjunction withthe invention as illustrated in the drawings will enable the reader toobtain a clear understanding and impression of the alleged features ofmerit and novelty sufficient to clarify the construction of theinvention as herein claimed.

Minor changes in shape, size, materials and rearrangement of parts maybe resorted to in actual practice so long as no departure is made fromthe invention as claimed.

Having described the invention, what claimed as new is:

1.111 a fan-style expansible and contractible safetyguard for use on ajointer or the like, guard means comprising a plurality ofinterconnected flat plates having shank portions at corresponding ends,said shank portions being stackedupon one another and .apertured, .a holstacked :upon one another and apertured, a hollow boltpassi-ng throughthe apertures and having headsat opposite ends engaging the adjacentshank portions, a solidbolt passing through said hollow bolt and havinga shoulder engaging one of the first-named heads and havinga-screwthreaded shank-portion projecting beyond the remaining head, anassembling nut on the screwthreadedendof said shank, a-U-shaped memberhaving parallel arms disposed on diametrically opposite sides of andhingedly connected to said nut, said armsv having cam locking membersengageable with an adjacent plate-section to bind the shank portionsofall plate sections together lowbolt' passing through'the aperturesandhaving heads atopposite ends engaging the adjacent shank portions, asolid boltpassing-through said hollow bolt andv having a shoulderengagingone of. the first-named heads and having. a screwthreaded shankportion projecting beyond the remainingheadan assembling nut onthescrewthreaded end of said shank, a ,U -shaped member having parallelarms disposed on diametrically opposite sidesof and hingedly connectedtosaid nutsaid arms having cam locking members engageable with anadjacent plate section to bind the shank portions of all plate sectionstogether or to loosen the same as required, said U-shaped member beingprovided with a hand-grip.

3. In a fan-style expansible and contractible safety guard for use on ajointer or the like,

guard means comprising a plurality of interconnected fiat plates havingshank portions at corresponding ends, said shank portions being stackedupon one another and apertured, a hollow bolt passing through theapertures and having heads-"at opposite ends engaging the adjacent shankportions, asolid bolt passing'through said hollow' bolt and having ashoulder engaging one opposite sides of and hingedly connected to'saidnut, said arms having cam locking members engageable with an adjacentplate section to bind the shank portions of all plate sections togetheror to loosen the same as required, said U-shaped member being providedwith a hand-grip together with a clip having a portion resting on oneshank portion and apertured to accommo date one head of the hollow bolt,and having'a flange portion engaging longitudinal edge portions of theshank portions. l

4. In a structure of the class described, in combination, a relativelyfixed support, a bolt having a stem portion fitted in a socket in saidsupport,

said bolt having a. shank portion and a flange providing a shoulder,said shank, portion being v screw-threaded, a safety guard embodying aplu 'rality of plate sections having shank portions disposed inoverlapping relationship and aper' tured, a hollow rivet having aheadengaging one shank portion and resting on the shoulder on said bolt,said hollow rivet surrounding the shank portion of the bolt, ascrew-threaded nut carried by the remaining end of the hollow rivet anden-, gaging the adjacentshank portion of one of said plate sections, acornice-clip having a plate partion apertured and surrou nding the nutand bearing directly against the adjacent shank'portion and havingan'edge flange 'right angularly disposed and engaging edge portions ofsaid shank portions, an assembling nut on the threaded end of saidshank, a U-shaped member hingedly mounted on said nut and having camsengaging the clip, and a handle connected to said U.-

shaped member.

o ONESIME BOISVERTQ REFERENCES CITED,

The following references are of record in the file of this patent:g

UNITED STATES PATENTS Number Name Date 738,883 Caton Sept. 15, 1903998,873 Couture July 25, 1911 1,235,403 Weaver July 31, 1917 1,788,663De May Jan. 13, 1931 1,801,326 Boisvert Apr. 21, 1931 Shaw June 30, 1931

